部署K8S集群（四）：部署MySQL

1. 密码文件：MySQL Secret

# VGVzdA== -> Test
# ZGJyZWFkZXI= -> root
# cGFzc0AxMjM0 -> pass@1234
mkdir -p /opt/mysql
mkdir -p /data/mysql
cat > /opt/mysql/mysql-secret.yaml << EOF
apiVersion: v1
kind: Secret
metadata:
  name: mysql-secret
type: Opaque
data:
  mysql-root-password: cGFzc0AxMjM0
  mysql-database: VGVzdA==
  mysql-user: ZGJyZWFkZXI=
  mysql-password: ZGJyZWFkZXI=
EOF

kubectl apply -f /opt/mysql/mysql-secret.yaml

2. 持久化存储：PersistentVolume、PersistentVolumeClaim

cat > /opt/mysql/mysql-pv.yaml << EOF
apiVersion: v1
kind: PersistentVolume
metadata:
  name: mysql-pv
spec:
  capacity:
    storage: 10Gi
  accessModes:
    - ReadWriteOnce
  hostPath:
    path: /data/mysql
EOF
kubectl apply -f /opt/mysql/mysql-pv.yaml

cat > /opt/mysql/mysql-pvc.yaml << EOF
apiVersion: v1
kind: PersistentVolumeClaim
metadata:
  name: mysql-pvc
spec:
  accessModes:
    - ReadWriteOnce
  resources:
    requests:
      storage: 10Gi
EOF
kubectl apply -f /opt/mysql/mysql-pvc.yaml

3. 配置文件：MySQL Deployment

cat > /opt/mysql/mysql-deployment.yaml << EOF
apiVersion: apps/v1
kind: Deployment
metadata:
  name: mysql-deployment
spec:
  replicas: 1
  selector:
    matchLabels:
      app: mysql
  template:
    metadata:
      labels:
        app: mysql
    spec:
      containers:
      - name: mysql
        image: mysql:latest
        env: 
        - name: MYSQL_ROOT_PASSWORD
          valueFrom:
            secretKeyRef:
              name: mysql-secret
              key: mysql-root-password
        - name: MYSQL_DATABASE
          valueFrom:
            secretKeyRef:
              name: mysql-secret
              key: mysql-database
        - name: MYSQL_PASSWORD
          valueFrom:
            secretKeyRef:
              name: mysql-secret
              key: mysql-password
        ports:
        - containerPort: 3306
        volumeMounts:
        - name: mysql-storage
          mountPath: /var/lib/mysql
      volumes:
      - name: mysql-storage
        persistentVolumeClaim:
          claimName: mysql-pvc
---
apiVersion: v1
kind: Service
metadata:
  name: mysql-service
spec:
  type: NodePort
  ports:
  - port: 3306
    targetPort: 3306
    nodePort: 30006
  selector:
    app: mysql
EOF

kubectl apply -f /opt/mysql/mysql-deployment.yaml

4. 利用cronjob实现备份

mkdir -p /backup/mysql
cat > /opt/mysql/mysql-backup-cronjob.yaml << EOF
apiVersion: batch/v1
kind: CronJob
metadata:
  name: mysql-backup
spec:
  schedule: "0 3 * * *"  # 可以根据需要调整备份时间
  jobTemplate:
    spec:
      template:
        spec:
          containers:
          - name: mysql-backup
            image: mysql:latest  # 确保这个镜像中包含 mysqldump
            command:
            - /bin/sh
            - -c
            - |
              mysqldump -h mysql-service -uroot -p$MYSQL_ROOT_PASSWORD $MYSQL_DATABASE > /backup/mysql/backup-$(date +\%F-\%H\%M\%S).sql
            env:
            - name: MYSQL_ROOT_PASSWORD
              valueFrom:
                secretKeyRef:
                  name: mysql-secret
                  key: mysql-root-password
            - name: MYSQL_DATABASE
              valueFrom:
                secretKeyRef:
                  name: mysql-secret
                  key: mysql-database
            volumeMounts:
            - name: backup-storage
              mountPath: /backup/mysql
          volumes:
          - name: backup-storage
            persistentVolumeClaim:
              claimName: mysql-pvc
          restartPolicy: OnFailure
EOF
kubectl apply -f /opt/mysql/mysql-backup-cronjob.yaml

5. 查看状态

kubectl get pods
#NAME                                READY   STATUS    RESTARTS       AGE
#mysql-deployment-57b4b9987c-h458p   1/1     Running   2 (15m ago)    15m